The term 'Giant Hall of Famer' refers to two baseball players, Mel Ott and Ott. Mel Ott was a Major League Baseball player who played for the New York Giants from 1926 to 1947. He was inducted into the Baseball Hall of Fame in 1951 and is widely regarded as one of the greatest hitters in the history of the game. Ott, on the other hand, was a Major League Baseball player who played for the St. Louis Cardinals from 1926 to 1947. He was also inducted into the Baseball Hall of Fame in 1951 and is considered one of the greatest hitters of all time.